Unfortunately Launcher has stopped working

[AC Question]

Okay, my stepdaughter did a system update on her ZTE phone. After the update finished an error message keeps popping up saying "Unfortunately Launcher has stopped working" When she presses okay this error message continues to pop up, she can't access anything. By the way she didn't do any other updates on her phone; like firmware update, etc. The only way she can access settings is pulling down the screen from top and hitting the settings icon. She went apps, clicked on Launcher and cleared her data & cache. That didn't help. She accessed the hidden menu (when you press/hold down volume button and hitting power button) and cleared phone cache, didn't help. What else can she try??? She really doesn't want to do a factory reset because she will lose all her photos, she doesn't have an SD card. She has to a Wifi signal from our library to be able to connect by the way. Please someone help!!!